Because of ________ high demand for Type AB blood, ________ supplies of it are u
题型：不详难度：来源：
Because of ________ high demand for Type AB blood, ________ supplies of it are usually limited.| A．the; the | B．不填；不填 | | C．不填；the | D．a; the |
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答案
| D |
解析
| D 考察冠词。句义：由于对AB血型血液的高需求，它的供应受到限制。第一空表示泛指，第二空特指AB型血型的供应。 |
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